 /*******************************************************************************
  * Copyright (c) 2003, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.navigator.extensions;

 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.ui.IMemento;
 import org.eclipse.ui.navigator.ICommonContentExtensionSite;
 import org.eclipse.ui.navigator.ICommonContentProvider;

 /**
  * @since 3.2
  */
 public final class SkeletonTreeContentProvider implements ICommonContentProvider {

     /**
      * The initialized singleton instance.
      */
     public static final SkeletonTreeContentProvider INSTANCE = new SkeletonTreeContentProvider();

     private static final Object [] NO_CHILDREN = new Object [0];

     private SkeletonTreeContentProvider() {
         super();
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
      */
     public Object [] getChildren(Object parentElement) {

         return NO_CHILDREN;
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
      */
     public Object getParent(Object element) {

         return null;
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
      */
     public boolean hasChildren(Object element) {
         return false;
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
      */
     public Object [] getElements(Object inputElement) {

         return NO_CHILDREN;
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.viewers.IContentProvider#dispose()
      */
     public void dispose() {
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
      * java.lang.Object, java.lang.Object)
      */
     public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
     }

     public void restoreState(IMemento aMemento) {

     }

     public void saveState(IMemento aMemento) {

     }

     public void init(ICommonContentExtensionSite aConfig) {

     }

 }

